We need to find out the LCM of 56 , 42 , 28 . So Lowest Common Multiple known as LCM is the lowest multiple which is divisible by all the numbers whose LCM is taken out . It can we done by two methods. Both of which are discussed in the attachment .
For complete solution kindly refer to the attachment .
It stands for Highest Common Factor . It is the highest numbers which divides out completely the numbers without leaving remainder of the numbers whose HCF is we are finding out .
You use additive inverse to combine like terms that are on opposite sides of the equation. ie. 3x + 1 = 6x -12 You use additive inverse to move -12 to the +1
6/7 of 1 3/4......turn the mixed number to an improper fraction...and " of " means multiply 6/7 * 7/4 = 42/28 = 1 1/2...so a compact car weighs 1 1/2 tons or 1.5 tons